Accidentally deleted some files and screwed up some icons, help!

I was trying to clear for some disk space and came across some useless looking files and deleted them. Emptied my recycle bin. When I went back to my downloads I realised that the icons for pdf and zip files are not displaying correctly, they are now the 'blank white paper' icon. And the 'windows store' icon has 'disappeared' from my taskbar, it's still there and I can click on it, but it's not displaying. Worst thing is that I have no idea what files I deleted. I tried using Recuva, but none of the files seem right. Any idea how to fix this?